| 摘要 |
Title compds. (I;R3=oxo;R13=lower alkyl, R17β=H,acyl, lower alkyl;R17aα=H, lower alkyl, ethinyl, vinyl, l, propinyl, chloroethinyl, butadienyl, propadienyl;The dotted line in ring A means additive C-C bond at 4,5-or 5(10)-position) are prepd. by hydrolysing compd. II(R13=group changed to 3-keto-Δ3 or 3-keto-Δ5(10) group by hydrolysis) with inoraganic acid or carboxylic acid in alcohol-H2O mixt. The final products exhibit hormanal action such as suppression of pregnancy or ovulation.
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